2778A Datasheet, PDF (1/2 Pages) Bel Fuse Inc. – MODEM MAGNETICS Global V.90 and V.34 Transformers

MODEM MAGNETICS
Global V.90 and V.34 Transformers
TM00403
• Intended for use in high-speed modem applications
• Features very low interwinding capacitance, well-
isolated windings, and low total harmonic distortion
• Qualified per Bellcore TR-TSY-000357-1
• Designed to comply with EN60950 requirements for a
reinforced insulation barrier with a working voltage
of 250V
• Approved by UL, CSA and BABT
• Minimum interwinding breakdown voltage of 3000 Vrms
ELECTRICAL SPECIFICATIONS at 25° C
Part
Number
Modem
Speed
Turns
Ratio
± 2%
Insertion
Loss
dB
Return Loss
dB
Frequency
Response
dB
DCR
Ω
max
@ 1 kHz 300 Hz - 1 kHz 100 Hz - 4000 Hz Pri Sec
Harmonic
Distortion
dB
Longitudinal
Balance
dB
300 Hz - 3500 Hz
2778A
V.90
1:1
< 1.2
> 18
2778B
V.34
1:1
< 1.2
> 20
< 0.5
69
69
> 86,
-9 dBm, 300 Hz
> 60
< 0.5
69
69
> -80,
-10 dBm, 600 Hz
> 60
SCHEMATIC
2778A
2778B
1
6
3
Primary
4
Secondary
©2000 Bel Fuse Inc. Specifications subject to change without notice. 05.00
Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com
T4-7